code: def __init__(self):
      self.begin_func_idx = -1
      self.end_func_idx = -1
  
file_path: nnabla/python/src/nnabla/utils/converter/nnablart/save_variable_buffer.py
imports: import numpy
label_desc: Use image node_id 1 to create a new _LifeSpan object  with example: obj = _LifeSpan()